Lens for eyeglasses.



No. 803,908. PATENTED NOV. '7, 1905. W. K KIGHT.

LENS FOR EYEGLASSES.

APPLIGATION FILED MAY11,19O5.

a? nv ni'ar: finesse? ,a/.W 5y 3 Z a w; agm wfig wit 'UNITED STATESPATENT OFFICE.

WILLIAM K. KIGHT, OF DEXTER, MISSOURI, ASSIGNOR' OF ONE-THIRD TO ROBERTF. JEAN, OF DEXTER, MISSOURI.

LENS FOR EYEGLASSES.

Specification of Letters Patent.

Patented Nov. 7, 1905.

Application filed May 11, 1905. Serial No. 259,978.

To aZZ whom it may concern:

Be it known that I, WILLIAM K. KIGHT, a citizen of the United States,residing at Dexter, Stoddard county, Missouri, have invented a certainnew and useful Improvement in Lenses for Eyeglasses, of which thefollowing is a full, clear, and exact description, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings,

forming part of this specification, in which-- Figure 1 is a sideelevational view of a pair of eyeglasses, showing my improved lensestherein. Figs. 2, 3, and L are similar views showing modified forms oflenses, and Figs. 1, 5, 6, and 7 are cross-sectional views showing diflerent forms of lenses.

This invention relates to trifocal lenses for eyeglasses, the objectbeing to construct an intermediate vision or field with upwardextensions at its ends, whereby the wearer may have his vision focalizedon objects at intermediate distances in glancing laterally or upwardlyin an oblique direction. Heretofore bifocal lenses have been made inwhich the reading field or vision, located at the lower portion of thelens, has been focalized at about fifteen inches, the remaining portionof the lens being either plane or convex, depending upon the conditionof the sight of the wearer for long-distance vision; but such field orvision if focalized for long distances is usually focalized at adistance of about twenty feet, so that between the reading vision andthe long-distance vision there is a space of some seventeen or eighteenfeet, within which range the wearer cannot see objects plainly.

My present invention consists in adding to the bifocal lens that is, onehaving a field or vision foealized at ordinary reading distance, sayfifteen inches, and a distance-field or vision, focalized, say, attwenty feetan intermediate field or vision having continuations at theends of the lens extending above the major axis of the lens, whereby thewearer can, in addition to focalizing his vision on objects within thefocal range of this intermediate-field or vision, while looking straightahead, also focalize his vision within the focal range of this field toone side or the other and slightly above the horizontal plane or visionin an oblique direction. This intermediate field or vision will startfrom the diminishing focal range of the reading field or vision andterminate at the commencement of the longdistance focal range.

In the drawings, 1 indicates a reading field or vision, located in thelower portion of the lens and which is preferably focalized at aboutfifteen inches, said field or vision being reduced in vertical depth sothat it is not in line of sight when walking.

2 indicates what I term a walking field or vision, which may befocalized at six or eight feet and which in the center of the lens doesnot extend above the horizontal line of sight of the major axis of thelens, but whose extremities at theends of the lens are projectedupwardly above the major axis of the lens.

3 is the long-distance field or vision, constituting the major portionabove the long axis of the lens, said field or vision being focalized atthe usual distance of about twenty feet. This field or vision 3,however, may be a plano-lens, depending upon the condition of theeyesight of the wearer.

In Fig. 1 of the drawings I have shown each lens provided with fields orvisions 2 at the ends thereof, while in Figs. 2 and 3 these areconnected so that the wearer may look straight ahead through thisintermediate field or vision.

Having thus described the invention, what is claimed as new, and desiredto be secured by Letters Patent, is

1. The herein-described lens for eyeglasses, the same consisting of alens having a short reading field or vision, located in thev lowerportion of the lens, intermediate fields or vis ions located at the endsof the lens and extending above the major axis thereof, and alongdistance field or vision constituting the major portion of the lensabove its major axis; substantially as described.

2. The herein-d escribed lens for eyeglasses, the same consisting of ashort-distance field or vision 1, an intermediate field or vision 2whose central portion is arranged below the major axis of the lens andwhose ends extend above the major axis of the lens, and a longdistancefield or vision constituting the principal portion of the lens above itsmajor axis; substantially as described.

3. The herein-described lens for eyeglasses, the same consisting of alens having a short reading field or vision located in the lower portionof the lens, intermediate fields or visions located at the ends of thelens, and a longsignature, in the presence of two Witnesses, this 8thday of May, 1905.

distance field or vision constituting the major WILLIAM KIGHT IWitnesses:

5 portion of the lens above its major axis; substantially as described.

In testimony whereof I hereunto aifix my F. R. CORNWALL, GEORGEBAKEWELL.

